Question

3.26 discussion: observing mitosis
read the discussion prompt and carefully write your response. remember:

• what you type here is public. a good rule of thumb is to only post things here that you would be comfortable communicating in person.
• responses should be well written (use a spell - checker) and clearly address the issue being discussed. you may wish to write your response in a word processing program, and then copy and paste it into the topic response box.
• your teacher will review postings regularly. any postings containing foul language or inappropriate topics will be removed, and the posting student will be referred to the administration. if you are in doubt about whether something is appropriate to post, either ask your teacher first, or just don’t post it.

review the grading rubric for discussion board activity. your teacher will use this rubric to grade your participation in this discussion. be sure to contact your teacher if you have any questions.

describe to your classmates the steps of mitosis that you identified. explain how you were able to tell one stage from another stage. respond to your classmates’ observations.

digital materials:
grading rubric for discussion board activity

Explanation:

Mitosis has four main stages - prophase (chromosomes condense, nuclear envelope breaks down), metaphase (chromosomes line up at cell - equator), anaphase (sister chromatids separate), and telophase (nuclear envelopes reform, chromosomes de - condense). One can differentiate stages by observing changes in chromosome appearance and position, as well as nuclear envelope status.

Answer:

The four main stages of mitosis are prophase, metaphase, anaphase, and telophase. Prophase is identified by chromosome condensation and nuclear envelope breakdown. Metaphase is when chromosomes line up at the cell's equator. Anaphase is characterized by the separation of sister chromatids. Telophase is when nuclear envelopes reform and chromosomes de - condense.